Consider this:
Total Democrats $461,328.05 *
Total Republicans $88,447.23 *
Kerry, John - $90,932.68
* totals by party for those in the list of top 25 offenders.
The total amount of overpayments to all eight of the republicans on the list of the top 25 offenders was less than the overpayment to Senator Jean Francois Querrie (D-France/Mass)
Your point is taken. However as it has been pointed out in the anecdote about Davey Crockett (I believe) and spending, it's not the amount that's an issue, it's that it happened at all