He just downplayed his liberal roots to increase his contrast with Barry in the short term. It was a transparent shell game and he never had a chance of beating the POTUS.
The main line of both Democrats and Republican are populist, TV is a populist media.
They have no obligation to report objective.
As for the allegation of voter fraud, the video in OP simply doesn't tell the whole story.
http://en.wikipedia.org/wiki/Republican_Party_presidential_primaries,_2012
According to this Romney won by a wide margin, period.
You can complain about this all you like, but the fact of the matter is you have to blame the voters for paying attention to the populist media and not scream foul play once you get beaten. That's how it works, thank you and try again.
So despite all popularism only works in a political vacuum. Had Paul's agenda been more coherent he would have beaten Romney despite being supported by the populist media.