Odds on Bush making a Magna Carta reference on its 800th anniversary? I'd do it if I were him; it would immediately set himself up as the natural anti-monarchist candidate to take down Obama/Clinton big government. It's not a fresh tactic, but, as just mentioned, he's just one of only a few viable candidates, and the other two (Walker and Christie) haven't declared yet.
As for his general viability, his nomination punts the greatest advantage the Republicans have in this election--dynastic fatigue. Sure, he'll rally the red states, but the last two elections showed us that wasn't enough. He'll try to pry open the Democrats' grip on Latinos, but while that might make the difference in his state of Florida, I don't see it making the difference anywhere else.
The Republican way to victory is through Christie, Walker, or a surprise mid-tier candidate catching lightning.
Great first post brah.