NFL's Carson Wentz Endorsed By Joe Biden 'Get On the Wentz Wagon!'

President Obama says his #2 is ALL IN on the Eagles rookie QB -- with Joe Biden advising POTUS to get on the "Wentz Wagon" ASAP.

Obama was stumping for Hillary Clinton out in Philly earlier Tuesday -- when he talked about how impressed his Vice President was with Carson Wentz when he attended the Eagles game over the weekend.

"He told me, 'Barack, you gotta get on the Wentz Wagon!'"

It's pretty funny ... but Obama says there's NO WAY he'll root for the Birds -- "I explained, 'Joe, I am a Bears fan and we play Philly next Monday night. So, I gotta stick with my team!"

FYI, Biden's a HUGE Eagles fan -- and even took pics with the team after Wentz led the team to victory on Sunday.