Sotimes its go, and we cannotnd take shower, actually. Woodruff all that and more,s on tonights newshour. Major funding for the pbs newshour has been provided by my moving our econoor 160 years. Bnsf, the engine that connects us. Fidelity investments. Consumer cellular. American cruise lines. Collette. Supporting social entrepreneurs and their solutions to the worlds most presng problems skollfoundation. Org. The lemelson foundation. Te cod to improving lives through invention, in the u. S. And develong countries. On the web at lemelson. Org. Supported by the john d. And catherine t. Macarthur foundation. Commted to building a more just, verdant and peaceful world. More information at macfound. Org and with the ongoing support of these institutions this program was made possible by the corporation for public broadcasting. And by contributions t pbs station from viewers like you. Thank you. President ial candidatesatic face off tonight in las vegas, and for the first time, Michael Bloom