the roots of his raisin

Santorum's actually doing quite well.

His candidacy seems to, as people say, "resonate" with the Republican "base."

From ABC news:

Rick Santorum reached a new high in favorable ratings from Republicans in the latest ABC News/Washington Post poll, numerically outpointing Mitt Romney among party regulars.

Within the GOP, 63 percent express a favorable opinion of Santorum, vs. a 58 percent favorable rating for Romney - not a statistically significant difference, but a challenging one for Romney given his advantages in campaign spending and, until recently, name recognition. Gingrich trails with just 43 percent favorability in his own party, a point away from his low two weeks ago.

The roots of his raisin run deep.