Hilary Clintons pledge is just a political strategy to attract more voters and for her to win the next election. But this is a good news to bitcoin industry, government backing up bitcoins will increase bitcoins stability in the market. I foresee an increase in bitcoins price if Clinton will win the presidency and I hope she will win so it will benefit us bitcoin users.
Even if this is just for getting votes, it seems fine, because at least this way someone serious would support btc.
However, I think there will be people who will say it's a bad thing, because the government just wants to take btc under control, deal with the tax problem and so on