It's probably time to start the series. Here's what Romney said yesterday:

"This is a president who has failed …  to communicate that military options are on the table and in fact in our hand. And that it’s unacceptable to America for Iran to have a nuclear weapon."

These are two bald-faced lies. Here is what Obama said just last week to Goldblog:

In the conversations I've had over the course of three years, and over the course of the last three months and three weeks, what I've emphasized is that preventing Iran from getting a nuclear weapon isn't just in the interest of Israel, it is profoundly in the security interests of the United States, and that when I say we're not taking any option off the table, we mean it …  I think that the Israeli government recognizes that, as president of the United States, I don't bluff. I also don't, as a matter of sound policy, go around advertising exactly what our intentions are. But I think both the Iranian and the Israeli governments recognize that when the United States says it is unacceptable for Iran to have a nuclear weapon, we mean what we say.

Nothing the president said to Jeffrey he has not said before. But he was more explicit than ever. That Romney simply invents positions that Obama has not held and does not hold is nothing new. He lies.