Every member of the House GOP leadership team endorsed the framework, which was quickly and loudly panned by conservative activists and elected officials including GOP conference member Sen. Jim Demint (R-SC).
McConnell's reluctance to take a position on the proposal reflects the extent to which the prospect of yielding to Obama on tax revenues, even in a modest way, splits the entire Republican Party. It also comes at a time when he is gearing up for his own re-election in 2014.
But he's not the only GOP leader keeping quiet about the House plan.
"I don't think Republican senators help that process by becoming outside commentators on what they're offering," Sen. Roy Blunt (R-MO), number five in the GOP leadership hierarchy, told reporters in the Capitol on Tuesday. "I don't have any position on the Boehner proposal."