They just want soundbites from a more central player. The only role for Boehner/Cantor is to thwart a special prosecutor. They are performing their role in the coverup, but it's still a very minor role.
A more central player?
The minority leader in the House has no power unless the majority leader or speaker gives it to her, or she usurps it, or the MSM simply ignores the Republicans and pretends that they don't exist. The majority leader and speaker set the House agenda, and simple majority vote rules.
On the other hand, the minority leader in the Senate has filibuster power from cloture unless he abdicates it or is afraid to use it.
-PJ