As bostrem00 pointed out the FCS national championship game is played in Frisco, TX. NDSU typically has traveled around 15000 fans (or more) to these games the past 3 years which is why you may have also seen shirts that say "We Roam Like It's Home" The cities of Frisco & Plano have absolutely fallen in love with the Bison fans to the point that at least one of the bars down there has become a booster for NDSU (Wild Pitch bar, formerly 3rd Base Bar) and flies a couple NDSU flags in their establishment. The first year we were there we drank 3rd Base completely out of beer and they had to send staff out to liquor stores to attempt to restock the coolers. The same day our pep rally drank a Marriott out of booze 3 times. The owner of 3rd Base was quoted as saying they made more profit in one day than they did the whole rest of the year (or something to that effect... I paraphrased a bit).
So anyway Bison fans have started referring to Texas as the 2nd home of the Bison.