President Barack Obama said North Carolina "is exhibit A of the unbelievable work that is being done at the grassroots level."
"You guys are just blowing it up when it comes to registering voters," he said in a seven-minute conference call with supporters Thursday.
The kind words are a consolation prize for thousands of N.C. supporters who planned to attend his acceptance speech in Bank of America Stadium in Charlotte until it was moved indoors.
Obama said "we can't let a little thunder and lightning get us down -- we're going to have to roll with it."
Campaign manager Jim Messina echoed the president's words, saying North Carolina volunteers "are truly the most amazing grassroots operation that I've seen."
The president and the campaign said they hope to hold a rally in North Carolina soon for those who couldn't attend. "Hopefully you'll have an even closer front row seat to the campaign," he said.
Obama also urged his supporters to work hard. "I need you to prove the cynics wrong one more time," he said.