Former U.N. Ambassador and defeated GOP primary rival Nikki Haley took a victory lap in an interview with Fox News host Bret Baier on Tuesday about her prediction that President Joe Biden would bow out in favor of Vice President Kamala Harris as the Democratic nominee. But she also told her party to find its footing, stop “whining” about Harris as the nominee, and start looking for substantive policy grounds to attack her. “Republicans should not be surprised that we are now running against Kamala Harris,” said Haley, who fought a bitter and contentious primary with Trump, including attacks on…