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glutBitmapCharacter issue

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I'm drawing a white quad and then rendering some text over top of it using glutBitmapCharacter, but the text is being covered by the quad.  Does anyone know why?  Given the order I do the rendering, the text should be on top of the quad.


void renderBitmapString(
		float x,
		float y,
		float z,
		void *font,
		char *string) {

	char *c;
	glRasterPos3f(x, y,z);
	for (c=string; *c != '\0'; c++) {
		glutBitmapCharacter(font, *c);

	glColor3f(0.9f, 0.9f, 0.9f);
		glVertex3f(-100.0f, -100.0f, 0.0f);
		glVertex3f(-100.0f, 100.0f,  0.0f);
		glVertex3f( 100.0f, 100.0f,  0.0f);
		glVertex3f( 100.0f, -100.0f, 0.0f);

	void *font= GLUT_BITMAP_8_BY_13;
	glColor3f(0.9f, 0.0f, 0.0f);
	renderBitmapString(30,15,0,font,(char *)"GLUT Tutorial @ Lighthouse3D");



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I tried drawing the text first, and then the quad and it fixes to problem.  But, I still have no idea why doing it backwards renders it correctly.

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