Because anyone who is actually left-leaning has always been made to look like a fool by his opponents and by the media. Ralph Nader lost much of his reputation once he tried running in 2000. Dennis Kucinich took a beating as well and eventually couldn't hold onto his Congressional spot due to political redistricting.
You could say the same thing for Ron Paul, but oddly enough, while everyone else saw him as crazy during the elections, his followers just became more cult-like.
The reason why the Republican candidate will come out stronger is because there are at least two reasonable candidates this time around to spar against each other. Previous elections you had "the winner" and you had "the rest". It was embarrassing to see Romney play the primary game against Michele"all Democrats are traitors" Bachmann, Herman "how many women have I harassed" Cain, Rick "Jesus always takes my wheel" Santorum, Ron "Buy more Gold" Paul and Texan Rick "Texas" Perry from Texas.
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