I thought Van Hollen already knighted by Sir Harry Reid?
My recollection of Van Hollen is that he's pretty ruthless. Maybe not as notoriously savage as someone like Jim Moran, but definitely not a pushover.
She better have her deck of race and gender cards handy, because he'll go after her very hard.
I'd also point out that Maryland just went thumbs-down on a black leftist democrat in the race for governor. Of course, that was an off-year election. I wouldn't bet on that happening in a Presidential year, but one can hope.