As this election winds down to the last few weeks, politicos and television personalities have become obsessed with polls. Some have been conducted accurately, some inaccurately -- but none have been worse and more far off than the USA Today/Rock the Vote survey of millennial voters.

Polls don't exist in isolation; most serious political analysts don't create an opinion about an election because of one poll. The aggregate a broad cross-section of several polls to make out how people and specific demographics will be voting any given election year.

The USA Today/Rock the Vote poll has been totally off the map from all other polling data.

According to that survey, Hillary Clinton has the largest lead among young voters than any candidate since Lyndon Johnson. They claim that Clinton has a bigger lead than even President Obama had in 2008.

No other poll reflects this, and there isn't a political analyst worth their salt who believes it. The Red Alert Politics Millennial Polling Average has with Clinton 47 percent, Trump 24 percent, Johnson 13 percent, and Stein 6 percent. The USA Today/Rock the Vote put the Democratic nominee 21 points higher at 68 percent.

If these numbers were even remotely true, the Clinton campaign wouldn't be scrambling to win over what the press has called "reluctant millennials."

Millennial turnout is critical for Democrats to have any chance in some swing states including Iowa, Ohio, and Indiana, which may be the reason why the Clinton campaign is trailing in all three.

The thing about polling is sometimes it's dead on, as it was in the 2012 election, and sometimes it's totally off, like in the 2014 midterm elections and some state polls in 2016. Even Nate Silver gets it wrong based on bad polling; he said that Hillary Clinton had more than a 99 percent chance of winning the Democratic primary in Michigan, a state she lost. He also said Trump was the odds-on-favorite to win Iowa; he didn't.

All polls should be taken with some level of skepticism, but when one is off from all the rest by 20 percent or more -- chances are it's garbage, just like the USA Today/Rock the Vote poll.