In part, anyway. Laura Vozzella reports on why the Virginia lieutenant governor ended his campaign:
Bolling had known he faced an uphill battle since that about-face in mid-June. But he decided to push on, pinning some of his hopes on the presidential race. Bolling had been a Mitt Romney supporter since the former Massachusetts governor ran for president four years ago. And twice, Bolling was chairman of Romney’s Virginia campaign effort.
A Romney win could have helped Bolling in several ways, his advisers thought. There was a chance that McDonnell, who had been mentioned often as a potential running mate for Romney, would be given a Cabinet position. If McDonnell moved on before his term was up, Bolling would have finished it, enjoying the advantages of running as an incumbent.