Missing: Republican warchest
The base on the Right is seething about immigration currently and has withheld from the RNC as a matter of protest. The candidates are doing poorly because none of the three are viewed as truly conservative. After incidents like Harriet Miers, U.A.E. ports, and immigration the Right is dubious about throwing money to these frontrunners. The Democrats meanwhile have three that appeal to it's base. When Thompson enters, I suspect the money will pour in and he'll get the nomination.
If it's Clinton vs Thompson, this quarter's campaign funds numbers will be all but forgotten as the prospects of a Clinton presidency will cure the rifts on the Right.
The Democrats could ensure victory with a nomination of Richarson but that is not likely to happen.