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The Dallas Cowboys were the only team to have clinched a playoff spot heading into Week 15. Three teams joined the Cowboys this past weekend as four of the 12 playoff spots have now been taken. The Oakland Raiders will play in the postseason for the first time since 2002. A dominant performance on Thursday Night Football against the Los Angeles Rams punched the Seattle Seahawks ticket to the playoffs as they clinched the NFC West. No postseason party would be complete without the New England Patriots joining as well. The Patriots clinched the AFC East title with a win over the Broncos. This still leaves eight spots that are up for grabs, and six divisions that have not been wrapped up. All this should lead to an exciting finish to the NFL season. There are several teams riding hot streaks that will make them a tough out in the postseason if they make it. The Pittsburgh Steelers, New York Giants and Miami Dolphins are three of the hottest teams in football. Each team is fighting for one of the remaining spots but all three will make a tough out if they make it given the momentum they are enjoying. Feel free to share your thoughts on the latest rankings by reaching out on Twitter @JonDAdams or leaving a comment here. Click the arrow on the right side of the above image to see Heavy's latest NFL power rankings for Week 15. (Getty)