Do your campaign contributions have an impact on the election?

Sometimes "grass roots" means cutting a check for thousands of dollars and cheering in front of the television.

With presidential primary candidates rallying unprecedented amounts of money for the 2008 election, many local residents have been doling out the maximum amount to the candidate of their choice. But with campaign war chests surpassing the $100 million mark, do local contributions of a couple of thousand dollars really have an impact with presidential candidates?