Democrats will hold onto an Oregon congressional seat left vacant when David Wu resigned in a sex scandal. Democrat Suzanne Bonamici defeated Republican Rob Cornilles Tuesday night. With 69 percent of the vote counted, Bonamici led Cornilles 54 percent to 39 percent. National Democrats poured more than $1 million into the Portland-area district, determined not to drop another safe seat after losing a New York district left vacant by Anthony Weiner, who acknowledged sending provocative text messages and resigned. . . . Democrats and their allies pummeled him with television ads that attacked his business credentials and tried to align...