My lawn mower cannot start, but if I take the air filter off, it can start perfectly. Now my air filter is saturated with gas or oil?

So now I am trying to find the craftsman 7.0 lawn mower air filter…

Not sure if this is the right one:

http://www.sears.com/craftsman-air-filter-for-briggs-stratton-engines/p-07133064000P?prdNo=9&blockNo=9&blockType=G9&PDP_REDIRECT=false&s_tnt=39869:4:0#desc