In october a group of Iowa Democrats gathered for a Barack Obama "house party". People were polite in Iowa, one guest explained, and they expected the same good behaviour from presidential candidates. But now, less than a month before the parties hold their nominating caucuses there on January 3rd, a slew of new polls have bad news for the front-runners, and the candidates have moved into attack mode. How, though, to sling their mud without upsetting Iowans?
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