Directly after his surprisingly strong showing in the Iowa caucus Rick Santorum experienced a significant and immediate bump in support in New Hampshire.  However, it now appears that was just a one time jump in support for Santorum instead of part of a growing trend.

Before the Iowa caucus Santorum’s support was only in the low single digits according to most polls; immediately after Iowa he jumped up to around 10 percent.  But since then Santorum hasn’t managed to gain any additional support.

For example the WMUR (PDF) poll had Santorum at just 4 percent in the poll from January 2-3rd right before the caucus. That went to 11 percent in the polling done between Jan 4-5th, but his support remains stuck at 11 percent in their polling from Jan 5-8th.

This is similar to what we see in the Suffolk University tracking polling. Santorum was at 5 percent in their poll released January 3rd. He shot up to 11 percent on Jan 6th, the first day of entirely post-Iowa polling. But in their poll released yesterday Santorum dropped back to just 8 percent.

Santorum’s strong showing in the Iowa caucus produced a significant boost for his campaign, immediately doubling his level of support in New Hampshire, but that rise seems to have stopped.  So the problem for Santorum is simply that he was starting from too deep of a deficit in New Hamshire to make it up.