Lawmakers have been sounding off on Twitter about the upheaval in Egypt, with tens of thousands of protesters spilling into the streets Saturday after President Hosni Mubarak pledged reforms Friday evening.

Colorado Democrat Rep. Jared Polis, who noted Saturday that he was watching the events unfold on Al Jazeera, tweeted:

We watch the events in the Arab world with hope and with fear; our hopes are for democracy and human rights to spread across the Arab world

Our fear is worse, more oppressive theological dictatorships. Outcome like Bolshevik & Iranian revolution?or like our American Revolution?

Rep. Dana Rohrabacher (R-Calif.) tweeted:

Mubarak should declare he nor his son will run in next year's election & pledge it will be free & honest, thus time for non-radicals.

Former ranking member on the Intelligence Committee Pete Hoekstra (R-Mich.) tweeted:

Op ed this week was prophetic. Be prepared for the unexpected. Clear Obama admin totally unprepared for what's happening in Egypt!

Rep. Keith Ellison is actively tweeting about the protests, and inspiring grass-roots activism for followers to put pressure on the White House:

Let's DO something.10k ltrs to WH urging pressure on Egyptian govt to release of M. El-Baradei, stop violence against protestors. C'mon!

Rep. Adam Schiff (D-Calif.) kept it short and direct:

needs to turn & back on.

State Department spokesman PJ Crowley has been using his Twitter feed to post reactions to the unfolding crisis, including to Mubarak's dismissal of his cabinet:

The government can't reshuffle the deck and then stand pat. President 's words pledging reform must be followed by action.