Mitt Romney is now up 21 points over his rivals in the South Carolina primary. If Mitt pulls off the trifecta and the wins in South Carolina next week after already taking Iowa and New Hampshire, it is a safe bet the Republican nomination will be his to lose. While anything can happen and there will still be 47 states left to vote (54 if you use Obama’s math), momentum (the “Big Mo”) is huge in politics and especially so in primaries. There is a dynamic that builds on itself and creates positive and negative feedback loops around each candidate. Donors and volunteers respond to these cues even more than regular voters and once momentum builds in one direction it can be difficult to stop the train. Ron Paul might be able to pull off a last minute surge, but that doesn’t seem likely at this point. Baring a misstep, Romney is likely to win South Carolina easily.