Robert F. Kennedy Jr.’s candidacy poses more of an issue for Donald Trump than it does for Joe Biden, according to a poll conducted by NBC News. When voters were asked solely about Biden and Trump, the former president is narrowly beating the incumbent 46% to 44%. When third-party candidates are introduced to the race, however, Biden pulls ahead of Trump. In a five-way race, Biden received 39% of the votes, followed by Trump at 37%, Kennedy at 13%, Jill Stein at 3 percent and Cornel West at 3 percent. Fifteen percent of the respondents who picked Trump in a two-way race picked Kennedy when the…