Is that all there is to this?
That was my first reaction as well. It's DC, after all and people don't just resign from Congress for no reason. Apparently being head dog at Heritage is enough to lure DeMint away from the bullshitetery of having to deal with Reid's fiscal obstructionism.
Personally, a cashier's job at McD's would have been enough to lure me out of that situation, but then I have a low tolerance for self-serving assclowns who like to economically rape the country solely for the sake of party politics.