The 2% Thorn

Carl M. Cannon of RealClearPolitics writes Alaska Senator Mark Begich claims to stand between President Obama's policies and Alaska, saying:

I’ll be a thorn in his ass.

Cannon adds:

A boast that hardly squares with a voting record 98 percent in sync with the White House.

I'd guess Begich will be a thorn exactly 2% of the time, wouldn't you?