As the leaders of G20 assemble in Cannes for their sixth summit, the leader in most demand could be the Chinese president, seen by some as a white knight who can rescue the euro in distress. The US has a more cynical view, and in some circles, China's rising financial clout is viewed as more threat than promise. It may be sheer fluke, but even coincidental reminders of a US decline add to rising temperatures in US-Chinese relations: China’s GDP growth rate for the year’s third quarter was 9.1 percent, the same percentage as the US unemployment rate for July, August and September.