Pool is riding a flatbed truck ahead of the presidential parade, rolling at 3:45 pm - about an hour behind schedule- down Constitution Av toward Pennsylvania Avenue, starting from holding area next to Russell SOB.
It's 47 degrees and cloudy, but a break in the drizzle.
Crowds lining both sides of the parade route, about 4-5 deep a side.
Beginning elements of POTUS motorcade is 4 media trucks behind us.
More to come en route.