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>> reporter: that's the thing they'll tell you. it's true. his entire career his success has been achieved never through getting major endorsements through lining up elected officials, there lining up big money donors. this is somebody that built a base outside the democratic party and republican party. he got to a point in his career in vermont he was almost more powerful because of support he had then the state democratic party. they almost had to come to him. that's how he got elected to the senate. there's no allusions when you talk to sanders people. they know the scale they're running ag...

The fact that you're both conservatives and you say that romney is a moderate, at some point does it make sense to get out of the race and give rick santorum a one on one shot at mitt romney who, as you point out, is not winning by very impressive margins in a lot of these states? >> well, that video, though, makes the point of why i haven't gotten out. when i was speaker of the house, we led an effort which led to four consecutive balanced budgets. when rick was in leadership, they ran up a 1.7 trillion dollar deficit. the very big differences, and i think just to put the label conservative a...

reality in the republican race. a few things are obvious. mitt romney for example is the clear and undisputed frontrunner but a front run where giant question marks. ten states voted last night and romney won six including the big contested battle ground of ohio. the math now very much on his side. romney's 429 delegates are more than all of his three rivals combined. and they put him almost 40% of the way to the magic number required to clinch the nomination. 23 states have now weighed in on the republican race. and romney has won a come bind 3.2 million votes or 39%. rick santorum ...