This is probably just an oversight, but it seems an odd one - today's Washington Post's lead article on Reagan lying in state in the Capitol Rotunda asserts:

Reagan will join a list of those who have lain in state beneath the Rotunda that includes Presidents Dwight D. Eisenhower, William H. Taft, Warren G. Harding, William McKinley Jr., James A. Garfield, Herbert Hoover and Lincoln.

That's seven other presidents, all Republicans. Have Democratic presidents not been given this honor, or is the Post just ignoring them?