Ten states hold primaries tomorrow, including one to pick the Republican to run for governor in California, a Democratic Senate run-off in Arkansas, and the Nevada Republican primary to pick the challenger to Senate Majority leader Harry Reid. Congress is back after a week off, with financial reform legislation at the top of the agenda. And the president began his week with an extensive briefing on the oil gusher in the Gulf of Mexico. We speak with Rick Klein, senior Washington news editor for ABC World News and host of the network's webcast "Top Line."

In North Dakota, the oil industry is taking off so quickly that "man camps" are being constructed to house all the new workers streaming in. We speak with Ward Koeser, the mayor of Williston, North Dakota, about how his town is struggling to bring schools and roads up to speed with the population boom.

Four Palestinian divers are dead and two missing off Gaza after the Israeli navy opened fire on them. The Israeli military said its forces prevented an attack on Israeli targets, but did not offer further explaination. The incident comes a week after nine pro-Palestinian activists were killed in a clash with naval commandos as their vessel tried to reach Gaza. The BBC's Jon Donnison joins us from Ramallah in the West Bank.

Turkey's tough stance against Israel is putting the country in the world spotlight and possibly cementing a leadership role among Muslim nations. It's also instilling a sense of pride in many Turks, who see their country forging its own path on the world stage. For the first time ever, the country has taken a side in the Israeli-Palestinian conflict and that could put Turkey and the U.S. at odds over Mideast foreign policy. Gulveda Ozgur, U.S. correspondent for the Turkish 24-hour cable station, Haber Turk, joins us with more.

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