HR 51, the bill in Congress for statehood for the District of Columbia, has 195 co-sponsors as of February 8. It has gained 40 co-sponsors in the last thirty days.
By contrast, other election-related constitutional amendments are not gaining co-sponsors. HJR 7, to provide for a direct popular election of the president, only has four co-sponsors and has not gained any co-sponsors since January 11. HJR 26, to increase the terms of U.S. House members from two years to four years, still has no co-sponsors.