RB vulnerable to GOP criticism on contributions?

Northwest Herald (Christopher Wills):

Republicans sense a chink in the governor's armor: Blagojevich, who was elected on a promise to clean up state government, continues to take money from contractors and award contracts to donors as he raises astonishing amounts of campaign cash.

"I think it's going to be a huge issue," said Sen. Christine Radogno, R-Lemont.

How vulnerable is Blagojevich on these issues? Don't the Republicans have to make a proposal to limit or ban contributions by contractors?

Without the Republicans proposing something better, doesn't this sorta seem like sour grapes? "I want to be the one shaking down contractors! I want mine!"