No there is not. In general, bold is for occasional strong emphasis, not for entire blocks of text. If everything was bold and you wanted to emphasize some text, or make it stand out you would not then have bold to do that. You could of course do italics for emphasis.
It is something that could be done via CSS and the Custom design Upgrade (although all the text would be bold all the time then). With the CSS upgrade though, you could set a different font with a wider stroke, or even set a slightly heavier font weight for the existing font.