Faithless electors are an integral part of the original idea behind the Electoral College... or at least part of its pretense (ignoring all the stuff about the three-fifths compromise).
The Electoral College was originally intended to be a body of reasonable, wise people who could negotiate with each other to find a compromise that served the interest of the states they represented. Having state legislatures direct EC delegates to vote a particular way is a more recent innovation.
In fact, I'm pretty sure that the arrangement in Senator Kern's proposal - i.e. that the state legislature chooses pledged electors - was only the case for a narrow slice of history.
The 2020 Supreme Court unanimously reaffirmed the power of states over their electoral votes, using state laws in effect on Election Day.
The decision held that the power of the legislature under Article II, Section 1 of the Constitution is “far reaching” and it conveys the “the broadest power of determination over who becomes an elector.” This is consistent with 130+ years of Supreme Court jurisprudence.
Now 48 states have winner-take-all state laws for awarding electoral votes.
2 award one electoral vote to the winner of each congressional district, and two electoral votes statewide.
Neither method is mentioned in the U.S. Constitution.
The electors are and will be dedicated party activist supporters of the winning party’s candidate who meet briefly in mid-December to cast their totally predictable rubberstamped votes in accordance with their pre-announced pledges.
The current system does not provide some kind of check on the "mobs." There have been 24,605 electoral votes cast since presidential elections became competitive (in 1796), and only 31 have been cast in a deviant way, for someone other than the candidate nominated by the elector's own political party (one clear faithless elector, 29 grand-standing votes, and one accidental vote). 1796 remains the only instance when the elector might have thought, at the time he voted, that his vote might affect the national outcome.
States have enacted and can enact laws that guarantee the votes of their presidential electors
April 10, 2018 - "US Judge: Colorado Electors Must Follow Popular Vote"
The U.S. Supreme Court has upheld state laws guaranteeing faithful voting by presidential electors (because the states have plenary power over presidential electors).
If any candidate wins the popular vote in states with 270 electoral votes, there is no reason to think that the Electoral College would prevent that candidate from being elected President of the United States
In 1789, in the nation's first election, a majority of the states appointed their presidential electors by appointment by the legislature or by the governor and his cabinet
The current statewide winner-take-all laws for awarding electoral votes are not in the U.S. Constitution. It was not debated at the Constitutional Convention. It is not mentioned in the Federalist Papers. It was not the Founders’ choice. It was used by only three states in 1789, and all three of them repealed it by 1800. It is not entitled to any special deference based on history or the historical meaning of the words in the U.S. Constitution. The actions taken by the Founding Fathers make it clear that they never gave their imprimatur to the winner-take-all method. The state based winner take all system was not adopted by a majority of the states until the 11th presidential election. - decades after the U.S. Constitution was written, after the states adopted it, one-by-one
Now, Each political party in each state nominates a slate of candidates for the position of presidential elector. This is most commonly done at the party’s congressional-district conventions and the party’s state convention during the summer or early fall. It is sometimes done in a primary.
Typically, each political party chair certifies to the state’s chief election official the names of the party’s candidate for President and Vice President and the names of the party’s candidates for presidential elector.
Under the “short presidential ballot” (now used in all states), the names of the party’s nominee for President and Vice President appear on the ballot.
When a voter casts a vote for a party’s presidential and vice-presidential slate on Election Day (the Tuesday after the first Monday in November), that vote is deemed to be a vote for all of that party’s candidates for presidential elector.