Just got back from DC yesterday, and everything went smooth. I ended my meetings on the House side of the Capitol in the CHOB (Cannon Building) around 245pm. I walked to Union Station from there in plenty of time get my bag out of storage, buy a ticket, and catch the 3:34 Marc to BWI. Train was crowded, but I boarded early and got a seat. Checked my bag and cleared security by 4:40pm, plenty of time for my 5:51pm flight to IAH.
Thanks again guys,
drnp