Robert F. Kennedy Jr. is running for president as a Democrat, according to paperwork filed Wednesday with the Federal Election Commission. Kennedy Jr. has not yet made a formal announcement. In a pinned post on his Twitter profile dated March 10, he directed supporters to the website TeamKennedy.com, which states it is funded by an exploratory committee. “If it looks like I can raise the money and mobilize enough people to win, I’ll jump in the race,” he wrote then.