Flashed a Rom and lost root

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http://forum.xda-developers.com – Hello Everyone, My Nexus 7 is rooted and was running AOKP. I decided to find another Rom to try out and downloaded one using ClockWorkMod. I rebooted into recovery and did a full wipe, then I installed the Rom. When I clicked reboot a message popped up but I was not able to read it entirely, it said something to the effect of "flashing this rom will overwrite........" and I didnt catch the rest. I tried to hit "Go Back" but the N7 rebooted into the new Rom. It was basically a stock rom so I tried to boot back into recovery and CWM was not installed. I downloaded i (HowTos)