S&P 500 up 13 points at the open

You can't keep the stock market down.

Yesterday's worries about the tax bill are fading and yesterday's 10 point loss in the S&P 500 has been erased. The index is up 13 points to 2665, in part because of strong earnings.

As the day wears on, Congress will start making noise again and that could curb the enthusiasm.